src/css.js

   1 // exclude the following css properties to add px
   2 var rexclude = /z-?index|font-?weight|opacity|zoom|line-?height/i,
   3         ralpha = /alpha\([^)]*\)/,
   4         ropacity = /opacity=([^)]*)/,
   5         rfloat = /float/i,
   6         rdashAlpha = /-([a-z])/ig,
   7         rupper = /([A-Z])/g,
   8         rnumpx = /^-?\d+(?:px)?$/i,
   9         rnum = /^-?\d/,
  10
  11         cssShow = { position: "absolute", visibility: "hidden", display:"block" },
  12         cssWidth = [ "Left", "Right" ],
  13         cssHeight = [ "Top", "Bottom" ],
  14
  15         // cache check for defaultView.getComputedStyle
  16         getComputedStyle = document.defaultView && document.defaultView.getComputedStyle,
  17         // normalize float css property
  18         styleFloat = jQuery.support.cssFloat ? "cssFloat" : "styleFloat",
  19         fcamelCase = function( all, letter ) {
  20                 return letter.toUpperCase();
  21         };
  22
  23 jQuery.fn.css = function( name, value ) {
  24         return jQuery.access( this, name, value, true, function( elem, name, value ) {
  25                 if ( value === undefined ) {
  26                         return jQuery.curCSS( elem, name );
  27                 }
  28
  29                 if ( typeof value === "number" && !rexclude.test(name) ) {
  30                         value += "px";
  31                 }
  32
  33                 jQuery.style( elem, name, value );
  34         });
  35 };
  36
  37 jQuery.extend({
  38         cssHooks: {
  39                 opacity: {
  40                         get: function( elem, force ) {
  41                                 var style = elem.style;
  42
  43                                 if ( jQuery.support.opacity && !style.filter ) {
  44                                         return false; // move along, nothing to see here
  45                                 }
  46
  47                                 // IE uses filters for opacity
  48                                 var ret = ropacity.test(elem.currentStyle.filter || "") ?
  49                                         (parseFloat(RegExp.$1) / 100) + "" :
  50                                         "";
  51
  52                                 return ret === "" ?
  53                                         "1" :
  54                                         ret;
  55                         },
  56
  57                         set: function( elem, value ) {
  58                                 var style = elem.style;
  59
  60                                 if ( jQuery.support.opacity && !style.filter ) {
  61                                         return false; // move along, nothing to see here
  62                                 }
  63
  64                                 // IE has trouble with opacity if it does not have layout
  65                                 // Force it by setting the zoom level
  66                                 style.zoom = 1;
  67
  68                                 // Set the alpha filter to set the opacity
  69                                 var opacity = parseInt( value, 10 ) + "" === "NaN" ?
  70                                         "" :
  71                                         "alpha(opacity=" + value * 100 + ")";
  72
  73                                 var filter = style.filter || jQuery.curCSS( elem, "filter" ) || "";
  74
  75                                 style.filter = ralpha.test(filter) ?
  76                                         filter.replace(ralpha, opacity) :
  77                                         opacity;
  78                         }
  79                 }
  80         },
  81
  82         style: function( elem, name, value ) {
  83                 // don't set styles on text and comment nodes
  84                 if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 ) {
  85                         return undefined;
  86                 }
  87
  88                 // ignore negative width and height values #1599
  89                 if ( (name === "width" || name === "height") && parseFloat(value) < 0 ) {
  90                         value = undefined;
  91                 }
  92
  93                 var style = elem.style || elem, set = value !== undefined;
  94
  95                 // Make sure we're using the right name for getting the float value
  96                 if ( rfloat.test( name ) ) {
  97                         name = styleFloat;
  98                 }
  99
 100                 name = name.replace(rdashAlpha, fcamelCase);
 101
 102                 var hooks = jQuery.cssHooks[name] || {};
 103
 104                 if ( set && (!("set" in hooks) || hooks.set( elem, value ) === false) ) {
 105                         style[ name ] = value;
 106                 }
 107
 108                 if ( "get" in hooks ) {
 109                         var cssHookReturn = hooks.get( elem, false );
 110                         if ( cssHookReturn !== false ) {
 111                                 return cssHookReturn;
 112                         }
 113                 }
 114
 115                 return style[ name ];
 116         },
 117
 118         css: function( elem, name, force, extra ) {
 119                 if ( name === "width" || name === "height" ) {
 120                         if ( elem.offsetWidth !== 0 ) {
 121                                 val = getWH( elem, name, extra );
 122
 123                         } else {
 124                                 jQuery.swap( elem, cssShow, function() {
 125                                         val = getWH( elem, name, extra );
 126                                 });
 127                         }
 128
 129                         return Math.max(0, Math.round(val));
 130                 }
 131
 132                 return jQuery.curCSS( elem, name, force );
 133         },
 134
 135         curCSS: function( elem, name, force ) {
 136                 var ret, style = elem.style, filter, hooks = jQuery.cssHooks[name] || {};
 137
 138                 // Make sure we're using the right name for getting the float value
 139                 if ( rfloat.test( name ) ) {
 140                         name = styleFloat;
 141                 }
 142
 143                 if ( "get" in hooks && ( ret = hooks.get( elem, force ) ) !== false ) {
 144                         return ret;
 145                 }
 146
 147                 if ( !force && style && style[ name ] ) {
 148                         ret = style[ name ];
 149
 150                 } else if ( getComputedStyle ) {
 151
 152                         // Only "float" is needed here
 153                         if ( rfloat.test( name ) ) {
 154                                 name = "float";
 155                         }
 156
 157                         name = name.replace( rupper, "-$1" ).toLowerCase();
 158
 159                         var defaultView = elem.ownerDocument.defaultView;
 160
 161                         if ( !defaultView ) {
 162                                 return null;
 163                         }
 164
 165                         var computedStyle = defaultView.getComputedStyle( elem, null );
 166
 167                         if ( computedStyle ) {
 168                                 ret = computedStyle.getPropertyValue( name );
 169                         }
 170
 171                         // We should always get a number back from opacity
 172                         if ( name === "opacity" && ret === "" ) {
 173                                 ret = "1";
 174                         }
 175
 176                 } else if ( elem.currentStyle ) {
 177                         var camelCase = name.replace(rdashAlpha, fcamelCase);
 178
 179                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 180
 181                         // From the awesome hack by Dean Edwards
 182                         // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 183
 184                         // If we're not dealing with a regular pixel number
 185                         // but a number that has a weird ending, we need to convert it to pixels
 186                         if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 187                                 // Remember the original values
 188                                 var left = style.left, rsLeft = elem.runtimeStyle.left;
 189
 190                                 // Put in the new values to get a computed value out
 191                                 elem.runtimeStyle.left = elem.currentStyle.left;
 192                                 style.left = camelCase === "fontSize" ? "1em" : (ret || 0);
 193                                 ret = style.pixelLeft + "px";
 194
 195                                 // Revert the changed values
 196                                 style.left = left;
 197                                 elem.runtimeStyle.left = rsLeft;
 198                         }
 199                 }
 200
 201                 return ret;
 202         },
 203
 204         // A method for quickly swapping in/out CSS properties to get correct calculations
 205         swap: function( elem, options, callback ) {
 206                 var old = {};
 207
 208                 // Remember the old values, and insert the new ones
 209                 for ( var name in options ) {
 210                         old[ name ] = elem.style[ name ];
 211                         elem.style[ name ] = options[ name ];
 212                 }
 213
 214                 callback.call( elem );
 215
 216                 // Revert the old values
 217                 for ( name in options ) {
 218                         elem.style[ name ] = old[ name ];
 219                 }
 220         }
 221 });
 222
 223 function getWH( elem, name, extra ) {
 224         var which = name === "width" ? cssWidth : cssHeight,
 225                 val = name === "width" ? elem.offsetWidth : elem.offsetHeight;
 226
 227         if ( extra === "border" ) {
 228                 return val;
 229         }
 230
 231         jQuery.each( which, function() {
 232                 if ( !extra ) {
 233                         val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
 234                 }
 235
 236                 if ( extra === "margin" ) {
 237                         val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
 238
 239                 } else {
 240                         val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
 241                 }
 242         });
 243
 244         return val;
 245 }
 246
 247 if ( jQuery.expr && jQuery.expr.filters ) {
 248         jQuery.expr.filters.hidden = function( elem ) {
 249                 var width = elem.offsetWidth, height = elem.offsetHeight,
 250                         skip = elem.nodeName.toLowerCase() === "tr";
 251
 252                 return width === 0 && height === 0 && !skip ?
 253                         true :
 254                         width > 0 && height > 0 && !skip ?
 255                                 false :
 256                                 jQuery.curCSS(elem, "display") === "none";
 257         };
 258
 259         jQuery.expr.filters.visible = function( elem ) {
 260                 return !jQuery.expr.filters.hidden( elem );
 261         };
 262 }